iec curve ref rom siprotec

8/3/2019 IEC Curve Ref Rom Siprotec

1/8

Normal Inverse

t = Trip time in seconds

I = Fault current

Ip = Setting value of the pickup current

Tp = Time dial

Time Factor = 0.19 0.05 0.1 0.2 0.4 0.8 1.6 3.2

Pickup Current = 1 1 1 1 1 1 1 1

Fault Current Time Curve

1.1 13.94 3.67 7.34 14.67 29.35 58.70 117.40 234.80

1.2 7.28 1.92 3.83 7.66 15.33 30.66 61.32 122.64

1.3 5.06 1.33 2.66 5.32 10.64 21.29 42.58 85.15

1.4 3.94 1.04 2.07 4.15 8.29 16.59 33.17 66.35

1.5 3.27 0.86 1.72 3.44 6.88 13.76 27.51 55.02

1.6 2.82 0.74 1.48 2.96 5.93 11.86 23.72 47.44

1.7 2.49 0.66 1.31 2.62 5.25 10.50 21.00 41.99

1.8 2.25 0.59 1.18 2.37 4.74 9.47 18.94 37.89

1.9 2.06 0.54 1.08 2.17 4.33 8.67 17.34 34.68

2 1.91 0.50 1.00 2.01 4.01 8.02 16.05 32.09

2.1 1.78 0.47 0.94 1.87 3.75 7.49 14.98 29.97

2.2 1.67 0.44 0.88 1.76 3.52 7.05 14.09 28.19

2.3 1.58 0.42 0.83 1.67 3.33 6.67 13.34 26.67

2.4 1.51 0.40 0.79 1.59 3.17 6.34 12.68 25.36

2.5 1.44 0.38 0.76 1.51 3.03 6.06 12.11 24.22

2.6 1.38 0.36 0.73 1.45 2.90 5.80 11.61 23.222.7 1.33 0.35 0.70 1.40 2.79 5.58 11.16 22.33

2.8 1.28 0.34 0.67 1.35 2.69 5.38 10.77 21.53

2.9 1.24 0.33 0.65 1.30 2.60 5.20 10.41 20.82

3 1.20 0.32 0.63 1.26 2.52 5.04 10.08 20.17

3.1 1.16 0.31 0.61 1.22 2.45 4.89 9.79 19.58

3.2 1.13 0.30 0.59 1.19 2.38 4.76 9.52 19.03

3.3 1.10 0.29 0.58 1.16 2.32 4.63 9.27 18.54

3.4 1.07 0.28 0.57 1.13 2.26 4.52 9.04 18.08

3.5 1.05 0.28 0.55 1.10 2.21 4.41 8.83 17.66

3.6 1.03 0.27 0.54 1.08 2.16 4.32 8.63 17.26

3.7 1.00 0.26 0.53 1.06 2.11 4.22 8.45 16.90

3.8 0.98 0.26 0.52 1.03 2.07 4.14 8.28 16.563.9 0.96 0.25 0.51 1.01 2.03 4.06 8.12 16.24

4 0.95 0.25 0.50 1.00 1.99 3.98 7.97 15.94

4.1 0.93 0.24 0.49 0.98 1.96 3.91 7.83 15.65

4.2 0.91 0.24 0.48 0.96 1.92 3.85 7.69 15.39

4.3 0.90 0.24 0.47 0.95 1.89 3.78 7.57 15.13

4.4 0.88 0.23 0.47 0.93 1.86 3.72 7.45 14.90

4.5 0.87 0.23 0.46 0.92 1.83 3.67 7.33 14.67

4.6 0.86 0.23 0.45 0.90 1.81 3.61 7.23 14.46

4.7 0.85 0.22 0.45 0.89 1.78 3.56 7.13 14.25

4.8 0.83 0.22 0.44 0.88 1.76 3.51 7.03 14.06

4.9 0.82 0.22 0.43 0.87 1.73 3.47 6.94 13.87

5 0.81 0.21 0.43 0.86 1.71 3.42 6.85 13.705.1 0.80 0.21 0.42 0.85 1.69 3.38 6.76 13.53

2.21

t=

0.14

IIp

0 .02

1

Tp


2/8

5.2 0.79 0.21 0.42 0.84 1.67 3.34 6.68 13.36

5.3 0.78 0.21 0.41 0.83 1.65 3.30 6.60 13.21

5.4 0.78 0.20 0.41 0.82 1.63 3.26 6.53 13.06

5.5 0.77 0.20 0.40 0.81 1.61 3.23 6.46 12.92

5.6 0.76 0.20 0.40 0.80 1.60 3.19 6.39 12.78

5.7 0.75 0.20 0.40 0.79 1.58 3.16 6.32 12.65

5.8 0.74 0.20 0.39 0.78 1.57 3.13 6.26 12.52

5.9 0.74 0.19 0.39 0.77 1.55 3.10 6.20 12.40

6 0.73 0.19 0.38 0.77 1.53 3.07 6.14 12.28

6.1 0.72 0.19 0.38 0.76 1.52 3.04 6.08 12.16

6.2 0.72 0.19 0.38 0.75 1.51 3.01 6.03 12.05

6.3 0.71 0.19 0.37 0.75 1.49 2.99 5.97 11.95

6.4 0.70 0.19 0.37 0.74 1.48 2.96 5.92 11.84


3/8

1 10 100

0.1

1

10

100

Column L

Column K

Column J

Column I

Column H

Column G

Column F

Column E

I/Ip

t [s]


4/8


5/8


6/8


7/8


8/8

iec curve ref rom siprotec

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